GB809517A - Hydraulically-actuated valve control system - Google Patents

Abstract

809,517. Fluid-pressure servomotor control systems. JAROCO ENGINEERING CO. June 28, 1956 [May 23, 1956], No. 20051/56. Class 135. An hydraulically actuated valve control system comprises a fluid conduit controlled by a valve, not shown but connected to the rod 100, means e.g. a rotary hydraulic motor connected to conduits 110, 112 for controlling the position of the valve, a remotely positioned control valve 114 actuated manually at 160 for the motor, indicating means 172, 176 operatively connected to the conduit valve for indicating its position, the indicating means including a follow-up system operatively connected to the conduit valve and the manual control, the follow-up system including a closed fluid system 190, 198, 204 responsive to movement of the closed fluid system to reflect the relative position of the conduit valve. Movement of the floating lever 160 to the left about the pivot 184 moves the piston valve 124 to the left allowing hydraulic fluid from a pump and accumulator to pass from pipe 134 to pipe 112 to rotate the motor in a valve opening direction, exhaust from the motor passing via pipe 110 to exhaust 154. As the motor rotates the stem 100 to open the valve the screw 218 moves a cam 214 downwards whereby hydraulic oil in bellows 204 is moved through pipe 198 into bellows 190 whereby the pivot 184 is displaced to the right to lap the control valve with the supply and exhaust ports so as to hold the valve in a position corresponding to the position of the lever 160. On releasing the lever 160 the piston valve is centred with a corresponding small movement of the lever 160 by a control valve centralizing spring 131.